This is xmllint and xsltproc compiled to JavaScript using Emscripten. xmllint has been customised to validate against Docbook schemas (see the included dtd and rng files), but the process described here could be used to create a generic version of xmllint.

USAGE

To see the library in action, download xsltproc.html and xsltproc.js. Note that Chrome has a bug with Web Workers - https://code.google.com/p/chromium/issues/detail?id=252492.

SETTING UP EMSCRIPTEN

https://gist.github.com/mcasperson/8274405 notes some of the configuration required under Fedora to get Emscripten working.

COMPILING

To compile xsltproc yourself, thete are some manual steps required.

Add the following line to the nanohttp.c in the xmllib2 distribution:

#define __LINUX_ERRNO_EXTENSIONS__

Configure and make xmllib2 and xmllint with the following commands:

emconfigure ./configure --without-python --without-threads --without-ftp --without-http
emmake make
emcc SAX.o entities.o encoding.o error.o parserInternals.o parser.o tree.o hash.o list.o xmlIO.o xmlmemory.o uri.o valid.o xlink.o HTMLparser.o HTMLtree.o debugXML.o xpath.o xpointer.o xinclude.o nanohttp.o nanoftp.o catalog.o globals.o threads.o c14n.o xmlstring.o buf.o xmlregexp.o xmlschemas.o xmlschemastypes.o xmlunicode.o xmlreader.o relaxng.o dict.o SAX2.o xmlwriter.o legacy.o chvalid.o pattern.o xmlsave.o xmlmodule.o schematron.o xzlib.o xmllint.o ~/git/emscripten/tests/zlib/libz.a -O2 -o ../xmllint.raw.js -s ASM_JS=0 --pre-js ../xmllint-pre.js --embed-file schemas/docbook45.dtd --embed-file schemas/docbook50.dtd

Configure and make the zlib library (included in emscripten/tests/zlib/) with the following commands:

emconfigure ./configure
emmake make

Configure and make xsltproc with the following commands:

chmod +x ../libxml2-2.9.1/xml2-config
emconfigure ./configure --with-libxml-src=../libxml2-2.9.1 --without-python
emmake make
export JAVA_HEAP_SIZE=4096m
cd docbook-xsl-1.78.1
emcc -s TOTAL_STACK=10485760 -s TOTAL_MEMORY=33554432 -O2 --llvm-opts 3 --llvm-lto 1 -s ASM_JS=0 --pre-js ../pre.js ../libxslt-1.1.28/xsltproc/xsltproc.o /home/matthew/emscripten/tests/zlib/adler32.o /home/matthew/emscripten/tests/zlib/compress.o /home/matthew/emscripten/tests/zlib/crc32.o /home/matthew/emscripten/tests/zlib/deflate.o /home/matthew/emscripten/tests/zlib/gzclose.o /home/matthew/emscripten/tests/zlib/gzlib.o /home/matthew/emscripten/tests/zlib/gzread.o /home/matthew/emscripten/tests/zlib/gzwrite.o /home/matthew/emscripten/tests/zlib/infback.o /home/matthew/emscripten/tests/zlib/inffast.o /home/matthew/emscripten/tests/zlib/inflate.o /home/matthew/emscripten/tests/zlib/inftrees.o /home/matthew/emscripten/tests/zlib/trees.o /home/matthew/emscripten/tests/zlib/uncompr.o /home/matthew/emscripten/tests/zlib/zutil.o ../libxslt-1.1.28/libexslt/common.o ../libxslt-1.1.28/libexslt/crypto.o ../libxslt-1.1.28/libexslt/date.o ../libxslt-1.1.28/libexslt/dynamic.o ../libxslt-1.1.28/libexslt/exslt.o ../libxslt-1.1.28/libexslt/functions.o ../libxslt-1.1.28/libexslt/math.o ../libxslt-1.1.28/libexslt/saxon.o ../libxslt-1.1.28/libexslt/sets.o ../libxslt-1.1.28/libexslt/strings.o ../libxslt-1.1.28/libxslt/attributes.o ../libxslt-1.1.28/libxslt/attrvt.o ../libxslt-1.1.28/libxslt/documents.o ../libxslt-1.1.28/libxslt/extensions.o ../libxslt-1.1.28/libxslt/extra.o ../libxslt-1.1.28/libxslt/functions.o ../libxslt-1.1.28/libxslt/imports.o ../libxslt-1.1.28/libxslt/keys.o ../libxslt-1.1.28/libxslt/namespaces.o ../libxslt-1.1.28/libxslt/numbers.o ../libxslt-1.1.28/libxslt/pattern.o ../libxslt-1.1.28/libxslt/preproc.o ../libxslt-1.1.28/libxslt/security.o ../libxslt-1.1.28/libxslt/templates.o ../libxslt-1.1.28/libxslt/transform.o ../libxslt-1.1.28/libxslt/variables.o ../libxslt-1.1.28/libxslt/xsltlocale.o ../libxslt-1.1.28/libxslt/xslt.o ../libxslt-1.1.28/libxslt/xsltutils.o ../libxml2-2.9.1/.libs/libxml2.a -o ../xsltproc.raw.js --embed-file VERSION.xsl --embed-file lib/lib.xsl --embed-file common/af.xml --embed-file common/am.xml --embed-file common/ar.xml --embed-file common/ast.xml --embed-file common/as.xml --embed-file common/autoidx-kimber.xsl --embed-file common/autoidx-kosek.xsl --embed-file common/az.xml --embed-file common/bg.xml --embed-file common/bn_in.xml --embed-file common/bn.xml --embed-file common/bs.xml --embed-file common/ca.xml --embed-file common/charmap.xml --embed-file common/charmap.xsl --embed-file common/common.xml --embed-file common/common.xsl --embed-file common/cs.xml --embed-file common/cy.xml --embed-file common/da.xml --embed-file common/de.xml --embed-file common/el.xml --embed-file common/entities.ent --embed-file common/en.xml --embed-file common/eo.xml --embed-file common/es.xml --embed-file common/et.xml --embed-file common/eu.xml --embed-file common/fa.xml --embed-file common/fi.xml --embed-file common/fr.xml --embed-file common/ga.xml --embed-file common/gentext.xsl --embed-file common/gl.xml --embed-file common/gu.xml --embed-file common/he.xml --embed-file common/hi.xml --embed-file common/hr.xml --embed-file common/hu.xml --embed-file common/id.xml --embed-file common/insertfile.xsl --embed-file common/is.xml --embed-file common/it.xml --embed-file common/ja.xml --embed-file common/ka.xml --embed-file common/kn.xml --embed-file common/ko.xml --embed-file common/ky.xml --embed-file common/l10n.dtd --embed-file common/l10n.xml --embed-file common/l10n.xsl --embed-file common/labels.xsl --embed-file common/la.xml --embed-file common/lt.xml --embed-file common/lv.xml --embed-file common/ml.xml --embed-file common/mn.xml --embed-file common/mr.xml --embed-file common/nb.xml --embed-file common/nds.xml --embed-file common/nl.xml --embed-file common/nn.xml --embed-file common/olink.xsl --embed-file common/or.xml --embed-file common/pa.xml --embed-file common/pi.xml --embed-file common/pi.xsl --embed-file common/pl.xml --embed-file common/pt_br.xml --embed-file common/pt.xml --embed-file common/refentry.xml --embed-file common/refentry.xsl --embed-file common/ro.xml --embed-file common/ru.xml --embed-file common/sk.xml --embed-file common/sl.xml --embed-file common/sq.xml --embed-file common/sr_Latn.xml --embed-file common/sr.xml --embed-file common/stripns.xsl --embed-file common/subtitles.xsl --embed-file common/sv.xml --embed-file common/table.xsl --embed-file common/targetdatabase.dtd --embed-file common/targets.xsl --embed-file common/ta.xml --embed-file common/te.xml --embed-file common/th.xml --embed-file common/titles.xsl --embed-file common/tl.xml --embed-file common/tr.xml --embed-file common/uk.xml --embed-file common/utility.xml --embed-file common/utility.xsl --embed-file common/vi.xml --embed-file common/xh.xml --embed-file common/zh_cn.xml --embed-file common/zh_tw.xml --embed-file common/zh.xml --embed-file html/admon.xsl --embed-file html/annotations.xsl --embed-file html/autoidx-kimber.xsl --embed-file html/autoidx-kosek.xsl --embed-file html/autoidx-ng.xsl --embed-file html/autoidx.xsl --embed-file html/autotoc.xsl --embed-file html/biblio-iso690.xsl --embed-file html/biblio.xsl --embed-file html/block.xsl --embed-file html/callout.xsl --embed-file html/changebars.xsl --embed-file html/chunk-changebars.xsl --embed-file html/chunk-code.xsl --embed-file html/chunk-common.xsl --embed-file html/chunker.xsl --embed-file html/chunkfast.xsl --embed-file html/chunktoc.xsl --embed-file html/chunk.xsl --embed-file html/component.xsl --embed-file html/division.xsl --embed-file html/docbook.css.xml --embed-file html/docbook.xsl --embed-file html/ebnf.xsl --embed-file html/footnote.xsl --embed-file html/formal.xsl --embed-file html/glossary.xsl --embed-file html/graphics.xsl --embed-file html/highlight.xsl --embed-file html/html-rtf.xsl --embed-file html/htmltbl.xsl --embed-file html/html.xsl --embed-file html/index.xsl --embed-file html/info.xsl --embed-file html/inline.xsl --embed-file html/keywords.xsl --embed-file html/lists.xsl --embed-file html/maketoc.xsl --embed-file html/manifest.xsl --embed-file html/math.xsl --embed-file html/oldchunker.xsl --embed-file html/onechunk.xsl --embed-file html/param.xml --embed-file html/param.xsl --embed-file html/pi.xml --embed-file html/pi.xsl --embed-file html/profile-chunk-code.xsl --embed-file html/profile-chunk.xsl --embed-file html/profile-docbook.xsl --embed-file html/profile-onechunk.xsl --embed-file html/qandaset.xsl --embed-file html/refentry.xsl --embed-file html/sections.xsl --embed-file html/synop.xsl --embed-file html/table.xsl --embed-file html/task.xsl --embed-file html/titlepage.templates.xml --embed-file html/titlepage.templates.xsl --embed-file html/titlepage.xsl --embed-file html/toc.xsl --embed-file html/verbatim.xsl --embed-file html/xref.xsl
cd ..
./final.sh

A manual change to the generated code is required to fix a bug where Emscripten overwrites Module['print'] (see https://groups.google.com/forum/#!topic/emscripten-discuss/vRkHs0FNH_Y for details). In xmllint.js, change

else if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  Module['read'] = function read(url) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, false);
    xhr.send(null);
    return xhr.responseText;
  };
  if (typeof arguments != 'undefined') {
    Module['arguments'] = arguments;
  }
  if (typeof console !== 'undefined') {
    Module['print'] = function print(x) {
      console.log(x);
    };
    Module['printErr'] = function printErr(x) {
      console.log(x);
    };
  }

to

else if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  Module['read'] = function read(url) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, false);
    xhr.send(null);
    return xhr.responseText;
  };
  if (typeof arguments != 'undefined') {
    Module['arguments'] = arguments;
  }
  if (typeof console !== 'undefined') {
    /*
    We already define functions for print and printErr, so comment these out.

    Module['print'] = function print(x) {
      console.log(x);
    };
    Module['printErr'] = function printErr(x) {
      console.log(x);
    };
    */
  }